[test] Add a test for #41

[hongyuanjia]

Pull request overview

• Add a test for Issue warnings if input data covers much less than climatological averages #41.

[codecov-commenter]

Codecov Report

Merging #49 (5d64581) into master (79ab667) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #49   +/-   ##
=======================================
  Coverage   99.82%   99.83%           
=======================================
  Files           5        5           
  Lines        1167     1191   +24     
=======================================
+ Hits         1165     1189   +24     
  Misses          2        2           

Impacted Files	Coverage Δ
R/morph.R	100.00% <100.00%> (ø)

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